A horizontal and a vertical number line are used to divide a plane into four regions, called quadrants.
A plane set up according to this system is known as a coordinate plane .
The horizontal line is called theX-axis, and numbers on this axis are calledX-coordinates.
The vertical line is called the Y-axis, and numbers on this axis are called Y-coordinates.
The intersection of the X-axis and the Y-axis is a point called the origin
The order in which you name the coordinates is important. This means that a point identified by (10,5) is different from a point identified by (5,10). For this reason, the coordinates of a point on a coordinate plane are called an ordered pair.
- A horizontal and a vertical number line are used to divide a plane into four regions, called quadrants.
- A plane set up according to this system is known as a coordinate plane .
- The horizontal line is called the X-axis, and numbers on this axis are called X-coordinates.
- The vertical line is called the Y-axis, and numbers on this axis are called Y-coordinates.
- The intersection of the X-axis and the Y-axis is a point called the origin
- The order in which you name the coordinates is important. This means that a point identified by (10,5) is different from a point identified by (5,10). For this reason, the coordinates of a point on a coordinate plane are called an ordered pair.
- The origin has coordinates: (X,Y)
The example graph shows the following points: